#include<cstdio>
#include<iostream>
#include<unistd.h>
#include<cstring>

int main()
{
	//库函数
	printf("hello printf\n");
	fprintf(stdout, "hello fprintf\n");
	const char* s = "hello fwrite\n";
	fwrite(s, strlen(s), 1, stdout);

	//系统调用
	const char* ss = "hello write\n";
	write(1, ss, strlen(ss));

	//??
	fork();



	return 0;
}
